Carrier 19FA Instrukcja Użytkownika Pobierz pdf (Strona 8)

HVAC Training

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Title: Chiller High Voltage Motor Terminations Lesson Plan #: NMH30L050303

EO 1.1.1 Discuss the process of inspecting and re-torquing the chiller motor

terminals along with the tag out expectations on the permit which

will allow personnel to safely perform this task.

1.1.1.1 Introduction

In this objective the trainee will discuss inspecting and retorquing the various chiller motor terminals.

1.1.1.2 Main Idea

1) Terminal inspection

a) Assess and address workplace hazards.

b) Verify the permit is in place and is adequate for the work scope. Expectation is to install at

the starter a grounding spider. This is how the HVAC technician verifies de-energized

condition. We are expected to walk down our tags and approve permit boundaries before

starting work.

c) Before pumping down the machine perform a leak test of the machine.

d) Be sure to record the leaks found during the inspection with enough detail to ensure they

will be repaired once the machine is pumped down. This is particularly important if the

rework will be turned over to the next shift.

2) Three terminal styles:

a) There are three styles of high voltage terminal assemblies used on our 19FA chillers.

b) We will refer to them as the old style, the new style and the ceramic style.

c) The ceramic style is the only one available when a terminal replacement is required.

3) Torquing the terminal

a) Starting and stopping the chiller causes the power cables to the flex, this in turn causes the

pressure seal connection to loosen.

b) The packing nut and brass nut on the plastic terminals (old and new style) are torqued each

time the terminal is serviced. Whether a leak has been identified or not.

Emphasize: Re-torquing is only required on the plastic insulators.

i) Experience has shown that by performing this on a scheduled frequency leakage in this

area has been eliminated.

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Carrier 19FA Instrukcja Użytkownika Strona 8